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Cold sore
Cold sore: the tingling that precedes the blisters is the window in which to act.
Cold sores are caused by a virus that, after first contact, remains in the body in latent form and reactivates periodically. It is not a sign of neglect or poor immunity: a very large proportion of the population carries it, and what varies from person to person is how often it returns.
The course is fairly consistent and worth knowing. Before the blisters there is almost always a phase of tingling, itching or tension at the exact spot where the lesion will appear: it lasts from a few hours to a day. Then come the grouped blisters, which burst, crust over and heal within one or two weeks.
The practical consequence lies entirely in that first phase. Antiviral treatments are more effective the earlier they are started, ideally during the tingling and before blisters are visible. People with frequent recurrences learn to recognise that signal: it is the moment when the episode can be shortened, whereas once the crust has formed it can only be accompanied.
The useful window is the tingling, not the blister
This is the information that changes the outcome of every future episode. In most people herpes announces itself with a few hours of tingling or tension at the precise spot: that is when an antiviral has its greatest effect, because the virus is replicating and has not yet produced the lesion. Waiting to «see if it comes out» means losing exactly the phase in which the episode could have been shortened. Anyone with regular recurrences should already have a plan at home, rather than looking for one once the blister is there.
How it shows
- Tingling, itching or tension at the site, before any visible sign
- Grouped blisters on or around the lip
- Rupture of the blisters and formation of a crust
- Burning and discomfort in the first days
- Recurrence always at the same site or very close to it
- Frequent triggers: sun, fever, stress, menstruation
How we proceed
- 1Visit: confirmation of the picture and distinction from lesions that resemble it
- 2Review of frequency and of the factors triggering recurrences
- 3A strategy for reactivations, built around the prodromal phase
- 4Advice on lip sun protection, a frequent trigger
- 5Reassessment if episodes are very close together or atypical
Available treatments
- Dermatology visit
- Strategy for recurrences
- Lip sun protection
- Follow-up if the picture is atypical
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Frequently asked questions
Why does it always come back in the same place?+
Because after first contact the virus remains latent in a specific group of nerve cells, and when it reactivates it always travels the same route to the skin. The consistency of the site is no coincidence and is in fact one of the features that help recognise it: a lesion appearing in a different place each time deserves a look, because the story does not fit.
Is it contagious? Can I kiss or share cutlery?+
In the active phase yes, especially when blisters are present or have just burst: direct contact and objects touching the lesion can transmit it. Particular care is worth taking with newborns and with people whose immune defences are reduced, where the infection can be more serious. Avoiding contact and washing hands after touching the lesion is the essential measure.
Is the sun involved?+
It is one of the most frequently reported triggers, which is why many people describe catching it in the mountains or at the seaside. Intense exposure can favour reactivation, and protecting the lips with a high-factor stick is a simple, concrete measure for those whose recurrences are sun-related. It is not the only factor — fever, stress and menstruation recur just as often — but it is the one that takes least effort to act on.
Related reading
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